Monovinyltin trihalides and process for their preparation

Abstract

Disclosed are monovinyltin trihalides of he general formula (I): (x)(x.sup.1)(x.sup.2)Sn--C(R)═C(R.sup.1)--C(O)--R.sup.2(I) and a process for their preparation from 1,3-diketones, tin(II) halides and halogen acids.

We claim: 
     
       1. A compound of the following formula (I):   (x)(x.sup.1)(x.sup.2)Sn--C(R)═C(R.sup.1)--C(O)--R.sup.2(I)     in which R and R 2  are identical or different and each is an optionally substituted hydrocarbon, R 1  is H or any group that R is, and X, X 1  and X 2  are identical or different and each is chlorine, bromine or iodine.   
     
     
       2. A compound according to claim 1 of the general formula (I) in which R and R 2  are identical or different and each is selected from the group consisting of optionally substituted alkyl groups having 1-5 C atoms, aryl groups having 6-12 C atoms, and alkylaryl and arylalkyl groups having 7-12 C atoms; and each of X, X 1  and X 2  is chlorine or bromine. 
     
     
       3. A compound according to claim 1 of the general formula (I) in which R and R 2  are methyl groups, R 1  is hydrogen and X, X 1  and X 2  are identical or different and each is chlorine or bromine. 
     
     
       4. A process for the preparation of a compound of the general formula   (x)(x.sup.1)(x.sup.2)Sn--C(R)═C(R.sup.1)--C(O)--R.sup.2(I)     in which R and R 2  are identical or different and each is an optionally substituted hydrocarbon, R 1  is H or any group that R is, and X , X 1  and X 2  are identical or different and each is chlorine, bromine or iodine, comprising reacting a compound of the general formula II: ##STR3## in which R, R 1  and R 2  are as defined above with a compound of the formula SnX 2  (IV), in which X is chlorine, bromine or iodine, optionally in the presence of an inert, anhydrous organic solvent, and with one or more halogen acids of the general formula X--R 3  (III), in which X is chlorine, bromine or iodine and R 3  is the radical --C(O)--R 4  where R 4  is --R 5  --CH 3  or --R 5  --C(O)X, in which R 5  =--(CH 2 ) n  --, where n is 0-10, or R 4  is an optionally substituted cycloaliphatic, aromatic or araliphatic radical, at a temperature of 0°-100° C., and subsequently isolating the compound of the general formula (I).   
     
     
       5. The process as claimed in claim 4 wherein, in the compounds of the general formula (II), R and R 2  are identical or different and each is selected from the group consisting of optionally substituted alkyl groups having 1-5 C atoms, aryl groups having 6-12 C atoms, and alkylaryl and arylalkyl groups having 7-12 C atoms; and X, X 1  and X 2  is each chlorine, bromine or iodine. 
     
     
       6. The process as claimed in claim 5 wherein in the compounds of the general formula (II), R and R 2  are methyl groups, R 1  is hydrogen and X, X 1  and X 2  are identical or different and each is chlorine or bromine. 
     
     
       7. The process as claimed in claim 6 wherein said one or more halogen acids have the general formula X--R 3  (III) in which R 3  is an acyl group having 1-4 C atoms or a benzoyl radical, and X is chlorine, bromine or iodine. 
     
     
       8. The process as claimed in claim 7 wherein the reaction is carried out in the presence of an ether or a hydrocarbon or a chlorinated hydrocarbon at a temperature of 10°-80° C.